CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenue	$ 106,852	$ 109,067	$ 342,514	$ 339,064
Cost of goods sold	84,393	83,438	268,717	251,322
Gross profit	22,459	25,629	73,797	87,742
Operating expenses
Research and development	13,569	11,417	38,084	35,401
Selling, general and administrative	16,909	17,947	47,723	58,403
Investment impairment	600	0	600	0
Total operating expenses	31,078	29,364	86,407	93,804
Operating loss	(8,619)	(3,735)	(12,610)	(6,062)
Interest expense and other income (loss), net	(2,282)	(1,595)	(3,744)	(4,455)
Loss before income taxes	(10,901)	(5,330)	(16,354)	(10,517)
Income tax expense (benefit)	(1,015)	625	(37)	1,886
Net loss including noncontrolling interest	(9,886)	(5,955)	(16,317)	(12,403)
Net loss attributable to noncontrolling interest	(3,391)	(4,400)	(9,826)	(11,719)
Net loss attributable to Alpha and Omega Semiconductor Limited	$ (6,495)	$ (1,555)	$ (6,491)	$ (684)
Net loss per common share attributable to Alpha and Omega Semiconductor Limited
Basic (in dollars per share)	$ (0.26)	$ (0.06)	$ (0.26)	$ (0.03)
Diluted (in dollars per share)	$ (0.26)	$ (0.06)	$ (0.26)	$ (0.03)
Weighted average number of common shares attributable to Alpha and Omega Semiconductor Limited used to compute net loss per share
Basic (in shares)	24,894	24,084	24,711	23,938
Diluted (in shares)	24,894	24,084	24,711	23,938